Dear colleagues, Users may request reverse DNS delegation by creating "domain" objects in the RIPE Database. Such domain objects must contain "nserver" attributes to specify the name servers for a reverse DNS zone, and may contain "ds-rdata" attributes, to specify delegation signer (DS) records. When the RIPE NCC publishes these records in the appropriate parent zones, the Time to Live (TTL) of all these records is set at 172800 (two days). The TTL of delegation NS records may be overridden by the TTL of NS records from a zone's apex. Alternatively, many large resolvers ignore the TTL values of NS records and cap them at much lower values such as 21600. Finally, there is no way for a zone operator to change the TTL of a DS record, which is only present in a parent zone. Long TTLs can cause problems for users when they want to change their name servers or perform DNSSEC key roll-overs. A long TTL on a DS record is especially harmful when a user needs to do a key roll-over in an emergency. We propose to lower, in the first quarter of 2022, the TTL on NS records to 86400 and on DS records to 3600. We welcome feedback or discussion about this, ideally via the DNS Working Group mailing list. If you prefer to send your feedback directly to us, you can email dns@ripe.net. Regards, Anand Buddhdev RIPE NCC